Crankshaft assembly and compressor

Abstract

The application provides a crankshaft assembly and a compressor, wherein an eccentric part is provided with an oil outlet channel and a communication channel; a first oil guide groove is concavely arranged on the outer circumferential surface of the eccentric part, and the upper end and the lower end of the first oil guide groove respectively extend towards the upper end and the lower end of the eccentric part; the inner end of the oil outlet channel is in communication with the central through hole, and the outer end of the oil outlet channel extends to the groove bottom wall of the first oil guide groove; a second oil guide groove in a spiral shape is formed between the outer circumferential surface of the eccentric part and the inner circumferential surface of the roller; the upper end of the second oil guide groove is in direct communication or not in direct communication with the upper end of the first oil guide groove; the lower end of the second oil guide groove extends to the lower end of the first oil guide groove and is in communication with the lower end of the first oil guide groove; from the lower end of the second oil guide groove, the spiral direction of the second oil guide groove is opposite to the rotation direction of the crankshaft; a containing groove for containing the rolling part is arranged on the lower thrust surface of the eccentric part, the first end of the communication channel is in communication with the central through hole, and the second end of the communication channel is in communication with the containing groove.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressors, in particular to a crankshaft assembly and a compressor. BACKGROUND

[0002] The rotary compressor is commonly used in household air conditioners, and the internal power source is provided by a motor to drive the rollers in the pump body to rotate at high speed to realize the gas / liquid phase change of refrigerant in the air conditioner, thereby achieving the purpose of refrigeration and heating.

[0003] The crankshaft is an important transmission component in the compressor, which relies on centrifugal force to introduce lubricating oil from the bottom oil pool to each part of the component when rotating at high speed, and forms an oil film on the surface of the moving part to ensure that the moving part of the compressor can operate flexibly and efficiently.

[0004] However, changes in air conditioner functions (such as temperature rise and fall, mode change, start and stop, etc.) by the user make it easy for the rotary compressor to have insufficient time to form an oil film or have too low oil viscosity, increasing the probability of contact friction between the upper and lower flanges and the rollers and the crankshaft. Especially in low-frequency operation mode, it is difficult for the lubricating oil in the oil pool to be transported to the upper end component, which may cause contact friction; when the above contact friction occurs, the surface of the component is deformed, resulting in continuous deterioration of mechanical efficiency, and even causing instability, component failure and other risks. Therefore, it is necessary to achieve rapid wetting of each part of the component to avoid structural failure due to friction. SUMMARY

[0005] The main purpose of the present application is to provide a crankshaft assembly and a compressor to improve the lubrication effect.

[0006] In order to achieve the above object, according to one aspect of the present application, a crankshaft assembly is provided, which comprises a crankshaft and a roller, the crankshaft having a central through hole and comprising an eccentric part; the roller being sleeved at the eccentric part; the eccentric part being provided with an oil outlet channel and a communication channel; an outer circumferential surface of the eccentric part being concavely provided with a first oil guide groove, upper and lower ends of the first oil guide groove being respectively extended and arranged towards upper and lower ends of the eccentric part; an inner end of the oil outlet channel being in communication with the central through hole, an outer end of the oil outlet channel being extended to a groove bottom wall of the first oil guide groove; a second oil guide groove being formed between the outer circumferential surface of the eccentric part and an inner circumferential surface of the roller in a spiral shape; an upper end of the second oil guide groove being extended to the upper end of the first oil guide groove, the upper end of the second oil guide groove being in direct communication or not in direct communication with the upper end of the first oil guide groove; a lower end of the second oil guide groove being extended to the lower end of the first oil guide groove and being in communication with the lower end of the first oil guide groove; a spiral direction of the second oil guide groove being opposite to a rotation direction of the crankshaft from the lower end of the second oil guide groove; the eccentric part being provided with an accommodation groove for accommodating a rolling part on a lower thrust surface of the eccentric part, a first end of the communication channel being in communication with the central through hole, a second end of the communication channel being in communication with the accommodation groove; the rolling part being rolled when the crankshaft rotates; a rolling axis of the rolling part being perpendicular to a central axis of the crankshaft.

[0007] Further, the crankshaft assembly further comprises: a lower flange sleeved on the crankshaft; an upper surface of the lower flange being in contact with or having a gap with the lower thrust surface of the eccentric part; the upper surface of the lower flange being provided with an annular rolling track groove, the rolling part being arranged to roll along the rolling track groove.

[0008] Further, the accommodation groove and the communication channel are one or are multiple, the multiple accommodation grooves and the multiple communication channels being arranged in one-to-one correspondence; one rolling part being arranged in each accommodation groove.

[0009] Further, the rolling part is in a spherical structure.

[0010] Further, the second oil guide groove is arranged on the outer circumferential surface of the eccentric part or the inner circumferential surface of the roller.

[0011] Further, a value range of a groove depth of the second oil guide groove is greater than or equal to 0.2 mm and less than or equal to 1 mm.

[0012] Further, the first oil guide groove is a strip-shaped groove.

[0013] Further, the upper end of the first oil guide groove is located at the upper end of the eccentric part.

[0014] Further, the lower end of the first oil guide groove is located at the lower end of the eccentric part.

[0015] Further, the first oil guide groove is arranged to extend along an axial direction of the eccentric part.

[0016] Further, the oil outlet channel is one, and the outer end of the oil outlet channel is located between the upper end and the lower end of the first oil guide groove or at the lower end of the first oil guide groove.

[0017] Further, the diameter of the eccentric part is Φ2, the width of the second oil guide groove along the radial direction of the eccentric part is D, and 0.01≤D / Φ2≤0.05.

[0018] Further, the axial height of the eccentric part is X, the width of the second oil guide groove along the axial direction of the eccentric part is L, the axial height of the contact surface of the eccentric part and the roller is H, the diameter or equivalent diameter of the oil outlet channel is Φ1, and 0.3Φ1≤L≤0.15H; H<X.

[0019] Further, the rolling part is in a spherical structure, the groove wall surface of the accommodating groove matches and is attached to the outer wall surface of the rolling part, and the groove wall surface of the accommodating groove is part of a preset spherical surface; the radius of the preset spherical surface is R2; the diameter or equivalent diameter of the communication channel is Φ3, the diameter or equivalent diameter of the oil outlet channel is Φ1, 0.3Φ1≤Φ3≤0.6Φ1, and 0.7Φ3≤R2≤Φ3.

[0020] Further, the diameter of the rolling part is Φ4; 1.98R2≤Φ4<2R2.

[0021] Further, the groove side wall of the rolling track groove perpendicular to the extending direction of the rolling track groove is in an arc shape and has a radius R1, the groove side wall of the rolling track groove matches and is attached to the outer wall surface of the rolling part, and R1=R2.

[0022] Further, when the crankshaft is in a stationary state, the axial height of the gap between the lower thrust surface of the eccentric part and the lower flange is S; the axial height of the eccentric part is X, and the axial height of the roller is Y; 0.3*(Y-X)≤S≤0.6*(Y-X).

[0023] Further, the upper end of the central through hole is provided with a blind hole oil plug.

[0024] According to another aspect of the present application, a compressor is provided, which comprises the above-mentioned crankshaft assembly.

[0025] According to the technical solution of the present application, the crankshaft assembly comprises a crankshaft and a roller, the crankshaft comprises an eccentric part, and the roller is sleeved at the eccentric part so that the crankshaft drives the roller to rotate.

[0026] The crankshaft has a central through hole, the outer circumferential surface of the eccentric part is concavely provided with a first oil guide groove, the upper end and the lower end of the first oil guide groove are respectively extended to the upper end and the lower end of the eccentric part, the inner end of the oil outlet channel is communicated with the central through hole, and the outer end of the oil outlet channel is extended to the groove bottom wall of the first oil guide groove, so that the outer end of the oil outlet channel is communicated with the first oil guide groove.

[0027] The outer circumferential surface of the eccentric part and the inner circumferential surface of the roller form a second oil guide groove in a spiral shape, the upper end of the second oil guide groove is extended to the upper end of the first oil guide groove, the upper end of the second oil guide groove is directly communicated with or not directly communicated with the upper end of the first oil guide groove, the lower end of the second oil guide groove is extended to the lower end of the first oil guide groove, and the lower end of the second oil guide groove is directly communicated with the lower end of the first oil guide groove. The lower end of the second oil guide groove is the starting end of the second oil guide groove, the spiral direction of the second oil guide groove is opposite to the rotation direction of the crankshaft. The lower end of the second oil guide groove is the liquid inlet end of the second oil guide groove.

[0028] During the rotation of the crankshaft, the lubricating oil in the compressor oil pool is pumped into the central through hole from the lower end of the central through hole, the lubricating oil in the central through hole flows into the first oil guide groove through the oil outlet channel, and then flows into the second oil guide groove, wherein the lubricating oil enters the second oil guide groove from the lower end of the second oil guide groove. Part of the lubricating oil in the second oil guide groove is immersed in the gap between the eccentric part and the roller for lubrication, and the other part flows upward along the second oil guide groove to flow to the upper end of the eccentric part, and then flows between the upper thrust surface 1011 of the eccentric part and the upper flange 91 and between the long shaft segment 102 and the upper flange 91. By continuously supplying lubricating oil to the upper end of the eccentric part, the lubricating oil can efficiently infiltrate the cooperation gap between the crankshaft and the upper flange 91.

[0029] Since the upper end and the lower end of the first oil guide groove are respectively extended to the upper end and the lower end of the eccentric part, the first oil guide groove has a relatively large cavity to accommodate more lubricating oil, and more lubricating oil can be guided into the second oil guide groove. Since the second oil guide groove is spiral-shaped, the lubricating oil can flow upward along the second oil guide groove during the rotation of the crankshaft, so that there is enough lubricating oil in the circumferential and axial directions of the eccentric part to ensure the lubrication effect between the eccentric part and the roller, thereby avoiding or reducing the wear between the eccentric part and the roller.

[0030] The eccentric part is provided with a communication channel, the eccentric part has an upper thrust surface 1011 and a lower thrust surface, the lower thrust surface of the eccentric part is provided with a containing groove for containing the rolling part, the first end of the communication channel is communicated with the central through hole, and the second end of the communication channel is communicated with the containing groove. When the crankshaft rotates, the eccentric part drives the rolling part to roll, and the rolling axis of the rolling part is perpendicular to the central axis of the crankshaft.

[0031] During the rotation of the crankshaft, the lubricating oil in the central through hole flows to the accommodating groove through the communication channel, so that the accommodating groove and the lower thrust surface of the eccentric part have sufficient lubricating oil, ensuring the smooth rolling of the rolling part in the rolling track groove and ensuring the lubricating effect between the eccentric part and the lower flange, thereby avoiding or reducing the wear between the eccentric part and the lower flange.

[0032] The crankshaft assembly of the present application can efficiently transport the lubricating oil upward, not only realizing the rapid lubrication between the eccentric part and the roller, but also realizing the efficient lubrication between the upper / lower flange and the crankshaft, while avoiding or reducing the contact wear between the lower thrust surface of the eccentric part and the lower flange. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings accompanying the specification of the present application serve to provide further understanding of the present application, and the illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0034] Figure 1 A structural schematic view of one embodiment of a crankshaft of a crankshaft assembly according to the present application is shown;

[0035] Figure 2 A structural schematic view of another embodiment of a crankshaft of a crankshaft assembly according to the present application is shown;

[0036] Figure 3 A structural schematic view of still another embodiment of a crankshaft of a crankshaft assembly according to the present application is shown;

[0037] Figure 4 A structural schematic view of the crankshaft of the crankshaft assembly in Figure 3 from another perspective is shown;

[0038] Figure 5 A sectional view of the crankshaft of the crankshaft assembly in Figure 4 from A-A is shown;

[0039] Figure 6 An enlarged view of the crankshaft of the crankshaft assembly in Figure 5 from I is shown;

[0040] Figure 7 A sectional view of the crankshaft of the crankshaft assembly in Figure 4 from B-B is shown;

[0041] Figure 8 A bottom view of the crankshaft of the crankshaft assembly in Figure 4 is shown;

[0042] Figure 9 A structural schematic view of a pump body assembly of a compressor according to the present application is shown;

[0043] Figure 10 Fig. 4 shows an enlarged view of the pump body assembly in Fig. 3 at P; Figure 9 Fig. 5 shows a sectional view of the lower flange in Fig. 4 at C-C;

[0044] Figure 11 Fig. 6 shows a schematic view of the structure of the lower flange of the compressor according to the present application;

[0045] Figure 12 Fig. 7 shows an enlarged view of the roller of the pump body assembly in Fig. 4 at Q; Figure 11 Fig. 8 shows a sectional view of the lower flange in Fig. 6 at C-C;

[0046] Figure 13 Fig. 9 shows a schematic view of the structure of the roller of the pump body assembly in Fig. 6. Figure 9

[0047] Wherein, the above-mentioned drawings include the following reference signs:

[0048] 10, crankshaft; 101, eccentric portion; 1011, upper thrust surface; 1012, lower thrust surface; 102, long shaft section; 103, short shaft section; 11, central through hole; 111, blind hole oil plug; 12, oil outlet passage; 13, first oil guide groove; 14, accommodating groove; 15, communication passage; 151, first passage section; 152, second passage section;

[0049] 20, roller; 30, second oil guide groove; 40, lower flange; 41, rolling track groove; 50, rolling portion;

[0050] 91, upper flange; 92, cylinder. DETAILED DESCRIPTION

[0051] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0052] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0053] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component and / or combinations thereof.

[0054] The present application provides a crankshaft assembly, please refer to Figures 1 to 13 ​The crankshaft assembly comprises a crankshaft 10 and a roller 20, the crankshaft 10 comprises an eccentric part 101, and the roller 20 is sleeved at the eccentric part 101 so that the crankshaft 10 drives the roller 20 to rotate.

[0055] The crankshaft 10 has a central through hole 11, i.e. the central through hole 11 penetrates the crankshaft 10 along the axial direction of the crankshaft 10; the eccentric part 101 is provided with an oil outlet channel 12, and the outer circumferential surface of the eccentric part 101 is recessed with a first oil guide groove 13, the upper end and the lower end of the first oil guide groove 13 extend and are provided towards the upper end and the lower end of the eccentric part 101 respectively; the inner end of the oil outlet channel 12 communicates with the central through hole 11, and the outer end of the oil outlet channel 12 extends to the groove bottom wall of the first oil guide groove 13, so that the outer end of the oil outlet channel 12 communicates with the first oil guide groove 13.

[0056] The outer circumferential surface of the eccentric part 101 and the inner circumferential surface of the roller 20 form a second oil guide groove 30 in a spiral shape; the upper end of the second oil guide groove 30 extends to the upper end of the first oil guide groove 13, and the upper end of the second oil guide groove 30 directly communicates with or does not directly communicate with the upper end of the first oil guide groove 13; the lower end of the second oil guide groove 30 extends to the lower end of the first oil guide groove 13, and the lower end of the second oil guide groove 30 directly communicates with the lower end of the first oil guide groove 13. From the lower end of the second oil guide groove 30, i.e. the lower end of the second oil guide groove 30 as the starting end, the spiral direction of the second oil guide groove 30 is opposite to the rotation direction of the crankshaft 10. The lower end of the second oil guide groove 30 is the liquid inlet end thereof. Figure 4 The rotation direction of the second oil guide groove 30 is opposite to the rotation direction of the crankshaft 10.

[0057] Specifically, the upper end of the second oil guide groove 30 does not penetrate the groove side wall of the upper end of the first oil guide groove 13, so that the upper end of the second oil guide groove 30 does not directly communicate with the upper end of the first oil guide groove 13; or, the upper end of the second oil guide groove 30 penetrates the groove side wall of the upper end of the first oil guide groove 13, so that the upper end of the second oil guide groove 30 directly communicates with the upper end of the first oil guide groove 13. The lower end of the second oil guide groove 30 penetrates the groove side wall of the lower end of the first oil guide groove 13, so that the lower end of the second oil guide groove 30 directly communicates with the lower end of the first oil guide groove 13.

[0058] During the rotation of the crankshaft 10, the lubricating oil in the compressor oil pool is pumped into the central through hole 11 from the lower end of the central through hole 11; the lubricating oil in the central through hole 11 flows into the first oil guide groove 13 through the oil outlet channel 12, and then flows into the second oil guide groove 30; wherein the lubricating oil enters the second oil guide groove 30 from the lower end of the second oil guide groove 30. A part of the lubricating oil in the second oil guide groove 30 is immersed in the gap between the eccentric part 101 and the roller 20 for lubrication; another part of the lubricating oil flows upward along the second oil guide groove 30 to flow to the upper end of the eccentric part 101, and between the upper thrust surface 1011 of the eccentric part 101 and the upper flange 91, and between the long shaft section 102 and the upper flange 91; by continuously conveying lubricating oil to the upper end of the eccentric part 101, the lubricating oil can more efficiently infiltrate the fitting gap between the crankshaft 10 and the upper flange 91.

[0059] Since the upper end and the lower end of the first oil guide groove 13 are respectively arranged to extend towards the upper end and the lower end of the eccentric part 101, the first oil guide groove 13 has a relatively large groove cavity to accommodate more lubricating oil, and can guide more lubricating oil into the second oil guide groove 30; since the second oil guide groove 30 is spiral-shaped, during the rotation of the crankshaft 10, the lubricating oil can flow upward along the second oil guide groove 30, so that there is enough lubricating oil in the circumferential and axial directions of the eccentric part 101, to ensure the lubrication effect between the eccentric part 101 and the roller 20, thereby avoiding or reducing the wear between the eccentric part 101 and the roller 20.

[0060] Specifically, the lubricating oil is refrigeration oil.

[0061] The eccentric part 101 is provided with a communication channel 15; the eccentric part 101 has an upper thrust surface 1011 and a lower thrust surface 1012; the lower thrust surface 1012 of the eccentric part 101 is provided with a containing groove 14 for containing the rolling part 50, the first end of the communication channel 15 is in communication with the central through hole 11, and the second end of the communication channel 15 is in communication with the containing groove 14. When the crankshaft 10 rotates, the eccentric part 101 drives the rolling part 50 to roll; the rolling axis of the rolling part 50 is perpendicular to the central axis of the crankshaft 10.

[0062] Specifically, the crankshaft assembly further comprises a lower flange 40, the lower flange 40 is sleeved on the crankshaft 10, and the crankshaft 10 is rotatable relative to the lower flange 40; the upper surface of the lower flange 40 is in contact with or has a gap with the lower thrust surface 1012 of the eccentric part 101, and the upper surface of the lower flange 40 is a large plane thereof; the upper surface of the lower flange 40 is provided with a rolling track groove 41 in the form of a ring, and the rolling track groove 41 is arranged around the central axis of the crankshaft 10; the rolling part 50 is arranged to roll along the rolling track groove 41; that is, when the crankshaft 10 rotates, the rolling part 50 rolls along the rolling track groove 41 in the rolling track groove 41.

[0063] Specifically, the rolling part 50 is arranged between the accommodating groove 14 and the rolling track groove 41, so that the contact between the lower thrust surface 1012 of the eccentric part 101 and the lower flange 40 is replaced by the contact between the rolling part 50 and the lower flange 40.

[0064] During the rotation of the crankshaft 10, the lubricating oil in the central through hole 11 flows into the accommodating groove 14 through the communication channel 15, so that the accommodating groove 14 and the lower thrust surface 1012 of the eccentric part 101 are filled with sufficient lubricating oil, which ensures the smooth rolling of the rolling part 50 in the rolling track groove 41 and ensures the lubricating effect between the eccentric part 101 and the lower flange 40, thereby avoiding or reducing the wear between the eccentric part 101 and the lower flange 40.

[0065] It should be noted that when the second oil guide groove 30 upwardly transports the lubricating oil, the lubricating oil will generate a downward force on the second oil guide groove 30, which will increase the contact friction between the lower thrust surface 1012 of the eccentric part 101 and the upper surface of the lower flange 40; in order to avoid or reduce the contact friction between the lower thrust surface 1012 of the eccentric part 101 and the upper surface of the lower flange 40, the matching structure of the accommodating groove 14, the rolling part 50 and the rolling track groove 41 is arranged.

[0066] The lubricating oil in the central through hole 11 continuously lubricates the contact surface between the rolling part 50 and the accommodating groove 14 through the communication channel 15. The rolling track groove 41 has an oil retention function, which can provide lubrication for the contact surface between the rolling part 50 and the rolling track groove 41 at the moment of starting the compressor and during normal operation.

[0067] Optionally, the accommodating groove 14 and the communication channel 15 are one. Alternatively, the accommodating groove 14 and the communication channel 15 are multiple, the first ends of the multiple communication channels 15 are in communication with the central through hole 11; the multiple accommodating grooves 14 and the multiple communication channels 15 are arranged in one-to-one correspondence, the second end of each communication channel 15 is in communication with the corresponding accommodating groove 14. One rolling part 50 is arranged in each accommodating groove 14.

[0068] Optionally, the multiple accommodating grooves 14 are distributed along the circumference of the eccentric part 101.

[0069] In the present application, the crankshaft 10 further comprises a long shaft section 102 and a short shaft section 103 coaxially arranged, the long shaft section 102 is connected to the upper end of the eccentric part 101, and the short shaft section 103 is connected to the lower end of the eccentric part 101; the central axis of the eccentric part 101 is parallel to the central axis of the long shaft section 102; the lower flange 40 is sleeved on the short shaft section 103, and the upper flange 91 is sleeved on the long shaft section 102.

[0070] In the present application, the rolling part 50 is a spherical structure, i.e. the rolling part 50 is a ball.

[0071] Optionally, the rolling part 50 is made of high-carbon chromium steel.

[0072] Specifically, the rolling part 50 is clamped in the accommodating groove 14, and the rolling part 50 is rotatably arranged relative to the groove wall of the accommodating groove 14.

[0073] In the present application, the communication passage 15 comprises a first passage segment 151 and a second passage segment 152, a first end of the first passage segment 151 is a first end of the communication passage 15, a second end of the first passage segment 151 is connected with a first end of the second passage segment 152, and a second end of the second passage segment 152 is a second end of the communication passage 15; the first passage segment 151 and the second passage segment 152 are arranged at an included angle.

[0074] Optionally, the first passage segment 151 and the second passage segment 152 are perpendicular to each other; an extension direction of the first passage segment 151 is perpendicular to an axial direction of the crankshaft 10, and an extension direction of the second passage segment 152 is parallel to the axial direction of the crankshaft 10.

[0075] In the present application, optionally, the oil outlet passage 12 is perpendicular to the axial direction of the crankshaft 10.

[0076] In the present application, the first oil guide groove 13 is a strip-shaped groove.

[0077] Optionally, the first oil guide groove 13 is arranged along the axial direction of the eccentric part 101.

[0078] Specifically, the upper end of the first oil guide groove 13 is located at the upper end of the eccentric part 101; the lower end of the first oil guide groove 13 is located at the lower end of the eccentric part 101; in this way, sufficient lubricating oil can be ensured in the axial direction of the eccentric part 101.

[0079] In the present application, the oil outlet passage 12 is at least one.

[0080] As shown in Figure 1 , Figure 3 , Figure 4 When the oil outlet passage 12 is one, the outer end of the oil outlet passage 12 is located between the upper end and the lower end of the first oil guide groove 13, or the outer end of the oil outlet passage 12 is located at the lower end of the first oil guide groove 13.

[0081] As shown in Figure 2 When the oil outlet passage 12 is multiple, the outer end of one of the multiple oil outlet passages 12 is located between the upper end and the lower end of the first oil guide groove 13, and the outer end of another of the multiple oil outlet passages 12 is located at the lower end of the first oil guide groove 13.

[0082] Optionally, when the oil outlet passage 12 is one, the outer end of the oil outlet passage 12 is located at a middle position between the upper end and the lower end of the first oil guide groove 13.

[0083] Optionally, when the oil outlet channels 12 are multiple, the outer end of one of the multiple oil outlet channels 12 is located at a middle position between the upper end and the lower end of the first oil guide groove 13.

[0084] In the present application, the second oil guide groove 30 is arranged on the outer circumferential surface of the eccentric portion 101 or the inner circumferential surface of the roller 20.

[0085] In the present application, optionally, the groove depth of the second oil guide groove 30 is greater than or equal to 0.2 mm and less than or equal to 1 mm; the groove depth of the second oil guide groove 30 refers to the depth from the groove opening to the groove bottom. Since the second oil guide groove 30 penetrates the oil film high pressure area and the low pressure area, while increasing the conveying capacity of the second oil guide groove 30 to the lubricating oil as much as possible, the influence on the oil film carrying capacity is also minimized.

[0086] In the present application, optionally, the shape of the cross section of the second oil guide groove 30 perpendicular to the extension direction thereof is polygonal or arc-shaped. For example, the shape of the cross section of the second oil guide groove 30 perpendicular to the extension direction thereof is V-shaped or rectangular.

[0087] In the present application, optionally, the shape of the cross section of the oil outlet channel 12 perpendicular to the extension direction thereof is circular, or elliptical, or polygonal. For example, the shape of the cross section of the oil outlet channel 12 perpendicular to the extension direction thereof is rectangular.

[0088] In the present application, optionally, the diameter of the eccentric portion 101 is Φ2, the width of the second oil guide groove 30 along the radial direction of the eccentric portion 101 is D, and 0.01≤D / Φ2≤0.05.

[0089] In the present application, optionally, the axial height of the eccentric portion 101 is X, the width of the second oil guide groove 30 along the axial direction of the eccentric portion 101 is L, the axial height of the contact surface of the eccentric portion 101 and the roller 20 is H, the diameter or equivalent diameter of the oil outlet channel 12 is Φ1, and 0.3Φ1≤L≤0.15H; HX. Such design is conducive to the upward conveying of the lubricating oil in the second oil guide groove 30, while avoiding a significant reduction in the oil film carrying capacity.

[0090] In the present application, optionally, the rolling portion 50 is a spherical structure; the groove wall surface of the accommodating groove 14 matches and is attached to the outer wall surface of the rolling portion 50, so that the rolling portion 50 is clamped in the accommodating groove 14, and the rolling portion 50 is rotatably arranged relative to the groove wall of the accommodating groove 14; the groove wall surface of the accommodating groove 14 is part of a preset spherical surface; the radius of the preset spherical surface is R2. The diameter or equivalent diameter of the communication channel 15 is Φ3, the diameter or equivalent diameter of the oil outlet channel 12 is Φ1, 0.3Φ1≤Φ3≤0.6Φ1, and 0.7Φ3≤R2≤Φ3.

[0091] In the present application, optionally, the diameter of the rolling part 50 is Φ4; 1.98R2≤Φ4<2R2.

[0092] In the present application, optionally, the groove side wall of the rolling track groove 41 perpendicular to the extending direction of the rolling track groove 41 is arc-shaped and the radius thereof is R1, where the arc shape is a preset arc shape; the groove side wall of the rolling track groove 41 matches and is attached to the outer wall surface of the rolling part 50, and the rolling part 50 is rollably arranged along the rolling track groove 41; R1=R2.

[0093] Optionally, the cross section of the rolling track groove 41 perpendicular to the extending direction of the rolling track groove 41 is a part of a preset circle, and the preset circle includes a preset arc shape; the radius of the preset circle is R1.

[0094] In the present application, optionally, when the crankshaft 10 is in a static state, the axial height of the gap between the lower thrust surface 1012 of the eccentric part 101 and the lower flange 40 is S; the axial height of the eccentric part 101 is X, and the axial height of the roller 20 is Y; 0.3*(Y-X)≤S≤0.6*(Y-X); H≤Y<X.

[0095] In the present application, the upper end of the center through hole 11 is provided with a blind hole oil plug 111.

[0096] Optionally, an oil guide sheet is arranged in the center through hole 11.

[0097] The present application also provides a compressor comprising the crankshaft assembly described above.

[0098] Specifically, the compressor comprises a pump body assembly, and the pump body assembly comprises the crankshaft assembly described above; the pump body assembly further comprises an upper flange 91 and a cylinder 92.

[0099] Specifically, the compressor is a rotary compressor.

[0100] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0101] In the crankshaft assembly provided by the present application, the crankshaft assembly comprises a crankshaft 10 and a roller 20, the crankshaft 10 comprises an eccentric part 101, and the roller 20 is sleeved at the eccentric part 101, so that the crankshaft 10 drives the roller 20 to rotate.

[0102] The crankshaft 10 has a center through hole 11, the outer peripheral surface of the eccentric part 101 is recessed with a first oil guide groove 13, the upper end and the lower end of the first oil guide groove 13 are respectively arranged to extend towards the upper end and the lower end of the eccentric part 101; the inner end of the oil outlet channel 12 communicates with the center through hole 11, and the outer end of the oil outlet channel 12 extends to the groove bottom wall of the first oil guide groove 13, so that the outer end of the oil outlet channel 12 communicates with the first oil guide groove 13.

[0103] A second oil guide groove 30 in a spiral shape is formed between the outer peripheral surface of the eccentric portion 101 and the inner peripheral surface of the roller 20; the upper end of the second oil guide groove 30 extends to the upper end of the first oil guide groove 13, and the upper end of the second oil guide groove 30 is directly communicated with or not directly communicated with the upper end of the first oil guide groove 13; the lower end of the second oil guide groove 30 extends to the lower end of the first oil guide groove 13, and the lower end of the second oil guide groove 30 is directly communicated with the lower end of the first oil guide groove 13. The spiral direction of the second oil guide groove 30 is opposite to the rotating direction of the crankshaft 10 from the lower end of the second oil guide groove 30, i.e. the lower end of the second oil guide groove 30 as the starting end. The lower end of the second oil guide groove 30 is the liquid inlet end thereof.

[0104] During the rotation of the crankshaft 10, the lubricating oil in the compressor oil pool is pumped into the central through hole 11 from the lower end of the central through hole 11; the lubricating oil in the central through hole 11 flows into the first oil guide groove 13 through the oil outlet channel 12, and then flows into the second oil guide groove 30; wherein the lubricating oil enters the second oil guide groove 30 from the lower end of the second oil guide groove 30. Part of the lubricating oil in the second oil guide groove 30 is immersed in the gap between the interface of the eccentric portion 101 and the roller 20 for lubrication; the other part of the lubricating oil flows upward along the second oil guide groove 30 to flow to the upper end of the eccentric portion 101, and then flows between the upper thrust surface 1011 of the eccentric portion 101 and the upper flange 91, and between the long shaft section 102 and the upper flange 91; by continuously conveying lubricating oil to the upper end of the eccentric portion 101, the lubricating oil can more efficiently infiltrate the fitting gap between the crankshaft 10 and the upper flange 91.

[0105] Since the upper end and the lower end of the first oil guide groove 13 extend towards the upper end and the lower end of the eccentric portion 101 respectively, the first oil guide groove 13 has a relatively large groove cavity to accommodate more lubricating oil, and can guide more lubricating oil into the second oil guide groove 30; since the second oil guide groove 30 is in a spiral shape, during the rotation of the crankshaft 10, the lubricating oil can flow upward along the second oil guide groove 30, so that there is enough lubricating oil in the circumferential direction and the axial direction of the eccentric portion 101, ensuring the lubrication effect between the eccentric portion 101 and the roller 20, thereby avoiding or reducing the wear between the eccentric portion 101 and the roller 20.

[0106] The eccentric portion 101 is provided with a communication channel 15; the eccentric portion 101 has an upper thrust surface 1011 and a lower thrust surface 1012; the lower thrust surface 1012 of the eccentric portion 101 is provided with an accommodation groove 14 for accommodating the rolling portion 50; the first end of the communication channel 15 is communicated with the central through hole 11, and the second end of the communication channel 15 is communicated with the accommodation groove 14. When the crankshaft 10 rotates, the eccentric portion 101 drives the rolling portion 50 to roll; the rolling axis of the rolling portion 50 is perpendicular to the central axis of the crankshaft 10.

[0107] During the rotation of the crankshaft 10, the lubricating oil in the central through hole 11 flows into the containing groove 14 through the communication channel 15, so that the containing groove 14 and the lower thrust surface 1012 of the eccentric part 101 have sufficient lubricating oil, ensuring the smooth rolling of the rolling part 50 in the rolling track groove 41 and ensuring the lubricating effect between the eccentric part 101 and the lower flange 40, thereby avoiding or reducing the wear between the eccentric part 101 and the lower flange 40.

[0108] The crankshaft assembly of the present application can efficiently transport the lubricating oil upward, not only realizing the rapid lubrication between the eccentric part 101 and the roller 20, but also realizing the efficient lubrication between the upper / lower flange and the crankshaft 10, while avoiding or reducing the contact wear between the lower thrust surface 1012 of the eccentric part 101 and the lower flange 40.

[0109] The crankshaft assembly of the present application solves the problems of: 1. the contact friction of parts at the moment of starting the compressor; 2. the poor lubrication effect of the compressor during low-frequency operation; 3. the wear of the lower thrust surface of the crankshaft and the lower flange.

[0110] The crankshaft assembly of the present application: 1. the first oil guide groove 13 and the second oil guide groove 30 both have a certain oil retention capacity, so that the eccentric part 101 and the roller 20 can be pre-oiled at the moment of starting the compressor; 2. during the operation of the compressor, the second oil guide groove 30 can quickly and efficiently transport the lubricating oil from the bottom to the parts; 3. by setting the blind hole oil plug 111, the oil discharge rate can be reduced, and the cost is lower than that of the blind hole crankshaft; 4. when the outer end of the oil outlet channel 12 is located at the lower end of the first oil guide groove 13, the outer end of the oil outlet channel 12 is located at the rotation starting point of the second oil guide groove 30, and the lubricating oil can be quickly pumped from the bottom to the parts under low-frequency working condition; 5. the lower thrust surface 1012 of the eccentric part 101 and the lower flange 40 do not directly contact, but slide through the rolling part 50, which can effectively avoid the wear of the crankshaft 10 and the lower flange 40.

[0111] The crankshaft assembly of the present application can quickly pump the lubricating oil from the lower end to the upper end of each part, which not only avoids the wear between the crankshaft 10 and the roller 20 and the lower flange 40, but also avoids the wear between the crankshaft 10 and the upper flange 91.

[0112] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

[0113] Spatially relative terms, such as "beneath", "below", "lower", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device described is turned over in use, a downwardly-facing surface can then be oriented upwardly, and vice versa. Thus, the example term "below" can encompass both an orientation of below and above. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. The terms "first", "second", "third", etc., do not necessarily indicate any ordinal, chronological or other sequence unless expressly so defined by the relative terms or context.

[0114] The specific embodiments of the present application have been shown and described in order to illustrate the application. It will be understood by those skilled in the art that various modifications can be made to the embodiments without departing from the scope of the present application. Thus, the present application is not intended to be limited to the embodiments described herein but is to be accorded the full scope of the claims, and legal equivalents thereof, encompassing any modifications made available by the application.

Claims

1. A crankshaft assembly, comprising a crankshaft (10) and a roller (20), the crankshaft (10) having a central through hole (11) and comprising an eccentric portion (101); the roller (20) being sleeved at the eccentric portion (101); characterized in that, an oil outlet channel (12) and a communication channel (15) are arranged on the eccentric portion (101); a first oil guide groove (13) is concavely arranged on an outer circumferential surface of the eccentric portion (101), and upper and lower ends of the first oil guide groove (13) extend towards upper and lower ends of the eccentric portion (101) respectively; an inner end of the oil outlet channel (12) communicates with the central through hole (11), and an outer end of the oil outlet channel (12) extends to a groove bottom wall of the first oil guide groove (13); a second oil guide groove (30) in a spiral shape is formed between the outer circumferential surface of the eccentric portion (101) and an inner circumferential surface of the roller (20); an upper end of the second oil guide groove (30) extends to the upper end of the first oil guide groove (13), and the upper end of the second oil guide groove (30) directly communicates with or does not directly communicate with the upper end of the first oil guide groove (13); a lower end of the second oil guide groove (30) extends to the lower end of the first oil guide groove (13) and communicates with the lower end of the first oil guide groove (13); from the lower end of the second oil guide groove (30), a spiral direction of the second oil guide groove (30) is opposite to a rotation direction of the crankshaft (10); a receiving groove (14) for accommodating a rolling portion (50) is arranged on a lower thrust surface (1012) of the eccentric portion (101), a first end of the communication channel (15) communicates with the central through hole (11), and a second end of the communication channel (15) communicates with the receiving groove (14); when the crankshaft (10) rotates, the rolling portion (50) is driven to roll, and a rolling axis of the rolling portion (50) is perpendicular to a central axis of the crankshaft (10); the communication channel (15) comprises a first channel segment (151) and a second channel segment (152), a first end of the first channel segment (151) is the first end of the communication channel (15), a second end of the first channel segment (151) is connected with a first end of the second channel segment (152), and a second end of the second channel segment (152) is the second end of the communication channel (15); the first channel segment (151) and the second channel segment (152) are perpendicular to each other; an extension direction of the first channel segment (151) is perpendicular to an axial direction of the crankshaft (10), and an extension direction of the second channel segment (152) is parallel to the axial direction of the crankshaft (10).

2. The crankshaft assembly of claim 1, wherein The crankshaft assembly further comprises: a lower flange (40) sleeved on the crankshaft (10); an upper surface of the lower flange (40) is in contact with or has a gap with the lower thrust surface (1012) of the eccentric portion (101); the upper surface of the lower flange (40) is provided with an annular rolling track groove (41), and the rolling portion (50) is arranged to roll along the rolling track groove (41).

3. The crankshaft assembly according to claim 1 or 2, characterized in that, the accommodating grooves (14) and the communication channels (15) are one or more, and the plurality of accommodating grooves (14) and the plurality of communication channels (15) are arranged one-to-one; each accommodating groove (14) is provided with one rolling part (50); and / or the rolling part (50) is a spherical structure.

4. The crankshaft assembly according to claim 1, characterized in that, the second oil guide groove (30) is arranged on the outer circumferential surface of the eccentric part (101) or the inner circumferential surface of the roller (20); and / or the depth of the second oil guide groove (30) is greater than or equal to 0.2 mm and less than or equal to 1 mm.

5. The crankshaft assembly according to claim 1, characterized in that, the first oil guide groove (13) is a strip-shaped groove; and / or the upper end of the first oil guide groove (13) is located at the upper end of the eccentric part (101); and / or the lower end of the first oil guide groove (13) is located at the lower end of the eccentric part (101); and / or the first oil guide groove (13) extends along the axial direction of the eccentric part (101).

6. The crankshaft assembly according to claim 1 or 5, characterized in that, the oil outlet channel (12) is one, and the outer end of the oil outlet channel (12) is located between the upper end and the lower end of the first oil guide groove (13) or at the lower end of the first oil guide groove (13); or the oil outlet channel (12) is a plurality, and the outer end of one of the plurality of oil outlet channels (12) is located between the upper end and the lower end of the first oil guide groove (13), and the outer end of another of the plurality of oil outlet channels (12) is located at the lower end of the first oil guide groove (13).

7. The crankshaft assembly according to claim 1, characterized in that, the diameter of the eccentric part (101) is Φ2, the width of the second oil guide groove (30) along the radial direction of the eccentric part (101) is D, and 0.01≤D / Φ2≤0.05; and / or the axial height of the eccentric part (101) is X, the width of the second oil guide groove (30) along the axial direction of the eccentric part (101) is L, the axial height of the contact surface of the eccentric part (101) and the roller (20) is H, the diameter or equivalent diameter of the oil outlet channel (12) is Φ1, and 0.3Φ1≤L≤0.15H; HX.

8. The crankshaft assembly of claim 2, wherein, the rolling part (50) is a spherical structure, the groove wall surface of the accommodating groove (14) matches and fits with the outer wall surface of the rolling part (50), and the groove wall surface of the accommodating groove (14) is part of a preset spherical surface; the radius of the preset spherical surface is R2; the diameter or equivalent diameter of the communication channel (15) is Φ3, the diameter or equivalent diameter of the oil outlet channel (12) is Φ1, 0.3Φ1≤Φ3≤0.6Φ1, and 0.7Φ3≤R2≤Φ3; and / or the diameter of the rolling part (50) is Φ4; 1.98R2≤Φ4<2R2; and / or the diameter of the rolling part (50) is Φ4; 1.98R2≤Φ4<2R2; and / or The groove side wall of the rolling track groove (41) in the section perpendicular to the extending direction thereof is arc-shaped and has a radius R1, the groove side wall of the rolling track groove (41) matches and is attached to the outer wall surface of the rolling part (50), and R1=R2.

9. The crankshaft assembly of claim 2, wherein, When the crankshaft (10) is in a stationary state, the axial height of the gap between the lower thrust surface (1012) of the eccentric part (101) and the lower flange (40) is S; the axial height of the eccentric part (101) is X, the axial height of the roller (20) is Y; 0.3*(Y-X)≤S≤0.6*(Y-X).

10. The crankshaft assembly of claim 1, wherein, The upper end of the center through hole (11) is provided with a blind hole oil plug (111).

11. A compressor characterized by, The crankshaft assembly comprises the crankshaft assembly according to any one of claims 1 to 10.

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